clear_push_subscription.go

// Copyright 2024 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package subscriptions

// [START pubsub_clear_push_subscription]
import (
	"context"
	"fmt"
	"io"

	"cloud.google.com/go/pubsub"
)

// clearPushSubscription reverts a push subscription back to a pull based subscription.
func clearPushSubscription(w io.Writer, projectID, subID string) error {
	// projectID := "my-project-id"
	// subID := "my-sub"
	ctx := context.Background()
	client, err := pubsub.NewClient(ctx, projectID)
	if err != nil {
		return fmt.Errorf("pubsub.NewClient: %w", err)
	}
	defer client.Close()

	sub := client.Subscription(subID)
	cfg, err := sub.Update(ctx, pubsub.SubscriptionConfigToUpdate{
		PushConfig: &pubsub.PushConfig{},
	})
	if err != nil {
		return fmt.Errorf("sub.Update: %w", err)
	}
	fmt.Fprintf(w, "Cleared push subscription, reverting to pull: %+v\n", cfg)

	return nil
}

// [END pubsub_clear_push_subscription]